On Sun, 17 Jun 2007, Bruce Momjian wrote:

I have completed my first pass over the tsearch documentation:


They are from section 14 and following.

I have come up with a number of questions that I placed in SGML comments
in these files:


Teodor/Oleg, let me know when you want to go over my questions.

Below are my answers (marked as )

Comments to editorial work of Bruce Momjian.


it is useful to have a predefined list of lexemes.

Bruce, here should be list of types of lexemes !


It useless to attempt normalize <type>email address</type> using
morphological dictionary of russian language, but looks reasonable to pick
out <type>domain name</type> and be able to search for <type>domain

I dont' understand where did you get this para :)


All of the following functions that accept a configuration argument can
use either an integer <!-- why an integer --> or a textual configuration
name to select a configuration.

originally it was integer id, probably better use <type>oid</type>

This returns the query used for searching an index. It can be used to test
for an empty query. The <command>SELECT</> below returns <literal>'T'</>,
<!-- lowercase? --> which corresponds to an empty query since GIN indexes
do not support negate queries (a full index scan is inefficient):

capital case. This looks cumbersome, probably querytree() should
just return NULL.

The integer option controls several behaviors which is done using bit-wise
fields and <literal>|</literal> (for example, <literal>2|4</literal>):
<!-- why so complex? -->

to avoid 2 arguments

its <replaceable>id</replaceable> or <replaceable>ts_name</replaceable>; <!-- n
if none is specified that the current configuration is used.

I don't understand this question

<!-- why?  -->
Note that the cascade dropping of the <function>headline</function> function
cause dropping of the <literal>parser</literal> used in fulltext configuration

hmm, probably it should be reversed - cascade dropping of the parser cause
dropping of the headline function.

In example below, <literal>fulltext_idx</literal> is
a GIN index:<!-- why isn't this automatic -->

It's explained above. The problem is that current index api doesn't allow
to say if search was lossy or exact, so to preserve performance of
GIN index we had to introduce @@@ operator, which is the same as @@, but

nly the <token>lword</token> lexeme, then a <acronym>TZ</acronym>
definition like ' one 1:11' will not work since lexeme type
<token>digit</token> is not assigned to the <acronym>TZ</acronym>.
<!-- what do these numbers mean? -->

nothing special, just numbers for example.

<function>ts_debug</> displays information about every token of
<replaceable class="PARAMETER">document</replaceable> as produced by the
parser and processed by the configured dictionaries using the configuration
specified by <replaceable class="PARAMETER">cfgname</replaceable> or
<replaceable class="PARAMETER">oid</replaceable>. <!-- no need for oid

don't understand this comment. ts_debug accepts cfgname or its oid

Oleg Bartunov, Research Scientist, Head of AstroNet (www.astronet.ru),
Sternberg Astronomical Institute, Moscow University, Russia
Internet: [EMAIL PROTECTED], http://www.sai.msu.su/~megera/
phone: +007(495)939-16-83, +007(495)939-23-83

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